Lengthening, Cracking and Weldability Problems of Fe–Ni–Cr Alloy Tube

Ali Babakr, Fakhruddin Habiby

SABIC Technology Center P.O. Box 11669 Jubail, Saudi Arabia 31961.

DOI: 10.4236/jmmce.2009.82012                

Abstract

Ethylene pyrolysis furnace tubes which are made of high Cr-Ni alloys often become difficult to weld after few years in service due to carburization and creep damage. The presence of carburization, often attempted to detect by magnetic permeability, can escape detection due to high Cr-Ni content of the alloy. Based on optical microstructural analysis and supported by scanning electron microscopy, this paper establishes that carburized material becomes difficult to weld due to carburized internal layers of the tube and cause hot shortness. To provide a practical way out for ethylene furnace operators, a solution annealing heat-treatment is recommended to have a successful weld.

Keywords

ethylene, furnace, olefins, pyrolysis, steam cracking, Microstructure

Conflicts of Interest

The authors declare no conflicts of interest.

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